function imgFit (img, maxImgWidth) 
{ 
  if (typeof img.naturalWidth == 'undefined') { 
    img.naturalHeight = img.height; 
    img.naturalWidth = img.width; 
  } 
  if (img.width > maxImgWidth) { 
    img.height = Math.round(((maxImgWidth)/img.width)*img.height); 
    img.width = maxImgWidth; 
    img.title = 'Click image to view full size'; 
    img.style.cursor = 'move'; 
  } else if (img.width == maxImgWidth && img.width < img.naturalWidth) { 
    img.height = img.naturalHeight; 
    img.width = img.naturalWidth; 
    img.title = 'Click to fit in the browser window'; 
  } 
}